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问题 单项选择题

使微粒表面由固-气二相结合状态转成固-液二相结合状态的附加剂（）.

A．助悬剂

B．稳定剂

C．润湿剂

D．反絮凝剂

E．絮凝剂

答案

参考答案：C

解析：

助悬剂系指能增加分散介质的黏度以降低微粒的沉降速度或增加微粒亲水性的附加剂。润湿剂系指能增加疏水性药物微粒被水润湿的附加剂，其原理是使微粒表面由固-气二相结合状态转成固-液二相结合状态。絮凝剂通过降低微粒Zeta电位使混悬剂稳定，反絮凝剂的原理正相反。

阅读理解
阅读理解。
     Have you ever seen a windsock blowing in the wind? Well, you can make one of your own! This is a fun
game that you can do with things you may have at home. You just need to follow a few easy steps.
You will need: 
    ●one piece of colored paper 
    ●five ribbons 
    ●strong tape 
    ●a string 
    ●a pencil 		                           
What to do:
     Step 1: Decorate the paper. You can draw pictures on it. You can write your name. Do anything that will
make it special to you.
     Step 2: Roll the paper into the shape of a tube. Then stick the tube together at each end and in the middle
with a strong tape.
     Step 3: Use a pencil to make a hole into both sides of the tube. The holes should be only on one end of the
tube. Pull the string through both holes. Then tie the ends of the string together.
     Step 4: Make five holes around the top of the other end of the tube. Put a ribbon through each of the holes.
Tie firmly in case they get loose.
     Now your windsock is ready to use, but how does it work? Wind flows through the tube and makes it fly
and dance around. Hold the windsock up in the air by its string and run around. It will fly behind you. You can
also hang it outside and watch it dance around on its own!
1. Which of the following is needed for Step 2?
[ ]
A. Ribbons.
B. Tape.
C. A pencil.
D. A string.
2. After which step will your windsock be like this?
    
[ ]
A. Step 1.
B. Step 2.
C. Step 3.
D. Step 4.
3. Right after you put ribbons through the holes in the tube, you should _____.
[ ]
A. tie the ribbons firmly
B. tape the tube together
C. make holes in the tube
D. draw pictures on the paper
4. Why does the author write this passage?
[ ]
A. To tell an interesting story.
B. To teach an important lesson.
C. To give information about wind.
D. To explain how to make a windsock.
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单项选择题

容量大于10千瓦的电气设备外接地螺栓直径不小于（）。

A.Ｍ８

B.Ｍ１0

C.Ｍ１２

D.Ｍ１３
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